BMI Calculator
Body Mass Index (BMI) is a value derived from the mass and height of a person. The BMI is defined as the body mass divided by the square of the body height.
22.9
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How does the Body Mass Index (BMI) Calculator Work?
Body Mass Index (BMI) is a simple indicator of body fatness, used as a screening tool to identify whether an individual is underweight, normal weight, overweight, or obese. It is defined as a person's weight in kilograms divided by the square of their height in meters.
The BMI Formula
The formula differs slightly depending on whether you use the metric system or the imperial system:
1. Metric System
2. Imperial System
WHO Classification Table
The World Health Organization (WHO) classifies weight status based on BMI scores for adults:
| BMI Range | Weight Status |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
Worked Example
Suppose an adult male weighs 75 kg and has a height of 1.80 meters (180 cm).
- Height squared: 1.80 x 1.80 = 3.24.
- Apply formula:
BMI = 75 / 3.24 = 23.15. - According to WHO, 23.15 places him in the Normal weight category.
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Frequently Asked Questions
Q.What is a healthy BMI?
According to the WHO, a healthy BMI range is between 18.5 and 24.9.
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